Snowy_River said:Hmm. I've never heard a mountain lion being called a panther. This is especially inappropriate as the mountain lion is not of the panthera family. It is, in fact, a Puma Concolor. There are several families that contribute to the 'big cats', not just the panthera.
Local names vary greatly, and panther is one that is used for the puma.
There is but one taxonomic family that makes up "the big cats" - felidae. There is no family called panthera.
You probably meant genera. Even so, all big cats belong to the genera panthera (see below). The cheetah, like the puma, is not a big cat. Big cats roar, small cats purr. Both cheeetahs and pumas purr, but do not roar. Cheetahs are given their own genera, Acinonyx, since they have other unique characteristics - like non-retractable claws.
In 1996, there was a taxonimic change that increased the number of genera. There are now 4 genera in the sub-family pantherinae - panthera, neofelis, uncia and pardofelis. Still only members of the genera pathera are considered "big cats".